Divorce "dev_t" from the "major|minor" bitmap, which is now called

udev_t in the kernel but still called dev_t in userland.

Provide functions to manipulate both types:
        major()         umajor()
        minor()         uminor()
        makedev()       umakedev()
        dev2udev()      udev2dev()

For now they're functions, they will become in-line functions
after one of the next two steps in this process.

Return major/minor/makedev to macro-hood for userland.

Register a name in cdevsw[] for the "filedescriptor" driver.

In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.

In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits.  This will essentially
replace the current "alias" check code (same buck, bigger bang).

A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference.  If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.

Without DEVT_FASCIST I belive this patch is a no-op.

Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.

Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).

1 files changed, 3 insertions, 3 deletions

diff --git a/sys/nfs/nfs_serv.c b/sys/nfs/nfs_serv.c
index eef3d7f..7068050 100644
--- a/sys/nfs/nfs_serv.c
+++ b/sys/nfs/nfs_serv.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_serv.c  8.8 (Berkeley) 7/31/95
- * $Id: nfs_serv.c,v 1.75 1999/04/28 11:37:54 phk Exp $
+ * $Id: nfs_serv.c,v 1.76 1999/05/06 18:13:04 peter Exp $
  */
 
 /*
@@ -1453,7 +1453,7 @@ nfsrv_create(nfsd, slp, procp, mrq)
 				nfsm_reply(0);
 				return (error);
 			} else
-				vap->va_rdev = (dev_t)rdev;
+				vap->va_rdev = rdev;
 			nqsrv_getl(nd.ni_dvp, ND_WRITE);
 			error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap);
 			vput(nd.ni_dvp);
@@ -1619,7 +1619,7 @@ nfsrv_mknod(nfsd, slp, procp, mrq)
 		nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 		major = fxdr_unsigned(u_int32_t, *tl++);
 		minor = fxdr_unsigned(u_int32_t, *tl);
-		vap->va_rdev = makedev(major, minor);
+		vap->va_rdev = umakedev(major, minor);
 	}
 
 	/*